ABSTRACT
Noise can be characterized as unwanted sound. It is unwanted because it can cause hearing losses, interfere with speech communication, disturb sleep, and interfere with the performance of complex tasks. It may also be unwanted because it is annoying, disturbing moods, relaxation, and privacy. Noise will be discussed here in the context of air pollution, as air is the principal medium through which it is transmitted and received by the human ear.
